185 lines
6.7 KiB
C
185 lines
6.7 KiB
C
/* tic80.h -- Header file for TI TMS320C80 (MV) opcode table
|
||
Copyright 1996, 1997 Free Software Foundation, Inc.
|
||
Written by Fred Fish (fnf@cygnus.com), Cygnus Support
|
||
|
||
This file is part of GDB, GAS, and the GNU binutils.
|
||
|
||
GDB, GAS, and the GNU binutils are free software; you can redistribute
|
||
them and/or modify them under the terms of the GNU General Public
|
||
License as published by the Free Software Foundation; either version
|
||
1, or (at your option) any later version.
|
||
|
||
GDB, GAS, and the GNU binutils are distributed in the hope that they
|
||
will be useful, but WITHOUT ANY WARRANTY; without even the implied
|
||
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
||
the GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this file; see the file COPYING. If not, write to the Free
|
||
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
||
#ifndef TIC80_H
|
||
#define TIC80_H
|
||
|
||
/* The opcode table is an array of struct tic80_opcode. */
|
||
|
||
struct tic80_opcode
|
||
{
|
||
/* The opcode name. */
|
||
|
||
const char *name;
|
||
|
||
/* The opcode itself. Those bits which will be filled in with operands
|
||
are zeroes. */
|
||
|
||
unsigned long opcode;
|
||
|
||
/* The opcode mask. This is used by the disassembler. This is a mask
|
||
containing ones indicating those bits which must match the opcode
|
||
field, and zeroes indicating those bits which need not match (and are
|
||
presumably filled in by operands). */
|
||
|
||
unsigned long mask;
|
||
|
||
/* The format of this opcode. I.E. short-immediate, register, long
|
||
immediate, etc. FIXME: Will this ever be used? */
|
||
|
||
unsigned char format;
|
||
|
||
/* An array of operand codes. Each code is an index into the operand
|
||
table. They appear in the order which the operands must appear in
|
||
assembly code, and are terminated by a zero. FIXME: Adjust size to
|
||
match actual requirements when TIc80 support is complete */
|
||
|
||
unsigned char operands[8];
|
||
};
|
||
|
||
/* The table itself is sorted by major opcode number, and is otherwise in
|
||
the order in which the disassembler should consider instructions.
|
||
FIXME: This isn't currently true. */
|
||
|
||
extern const struct tic80_opcode tic80_opcodes[];
|
||
extern const int tic80_num_opcodes;
|
||
|
||
|
||
/* The operands table is an array of struct tic80_operand. */
|
||
|
||
struct tic80_operand
|
||
{
|
||
/* The number of bits in the operand. */
|
||
|
||
int bits;
|
||
|
||
/* How far the operand is left shifted in the instruction. */
|
||
|
||
int shift;
|
||
|
||
/* Insertion function. This is used by the assembler. To insert an
|
||
operand value into an instruction, check this field.
|
||
|
||
If it is NULL, execute
|
||
i |= (op & ((1 << o->bits) - 1)) << o->shift;
|
||
(i is the instruction which we are filling in, o is a pointer to
|
||
this structure, and op is the opcode value; this assumes twos
|
||
complement arithmetic).
|
||
|
||
If this field is not NULL, then simply call it with the
|
||
instruction and the operand value. It will return the new value
|
||
of the instruction. If the ERRMSG argument is not NULL, then if
|
||
the operand value is illegal, *ERRMSG will be set to a warning
|
||
string (the operand will be inserted in any case). If the
|
||
operand value is legal, *ERRMSG will be unchanged (most operands
|
||
can accept any value). */
|
||
|
||
unsigned long (*insert) PARAMS ((unsigned long instruction, long op,
|
||
const char **errmsg));
|
||
|
||
/* Extraction function. This is used by the disassembler. To
|
||
extract this operand type from an instruction, check this field.
|
||
|
||
If it is NULL, compute
|
||
op = ((i) >> o->shift) & ((1 << o->bits) - 1);
|
||
if ((o->flags & PPC_OPERAND_SIGNED) != 0
|
||
&& (op & (1 << (o->bits - 1))) != 0)
|
||
op -= 1 << o->bits;
|
||
(i is the instruction, o is a pointer to this structure, and op
|
||
is the result; this assumes twos complement arithmetic).
|
||
|
||
If this field is not NULL, then simply call it with the
|
||
instruction value. It will return the value of the operand. If
|
||
the INVALID argument is not NULL, *INVALID will be set to
|
||
non-zero if this operand type can not actually be extracted from
|
||
this operand (i.e., the instruction does not match). If the
|
||
operand is valid, *INVALID will not be changed. */
|
||
|
||
long (*extract) PARAMS ((unsigned long instruction, int *invalid));
|
||
|
||
/* One bit syntax flags. */
|
||
|
||
unsigned long flags;
|
||
};
|
||
|
||
/* Elements in the table are retrieved by indexing with values from
|
||
the operands field of the tic80_opcodes table. */
|
||
|
||
extern const struct tic80_operand tic80_operands[];
|
||
|
||
/* Values defined for the flags field of a struct tic80_operand. */
|
||
|
||
/* This operand takes signed values. */
|
||
#define TIC80_OPERAND_SIGNED (01)
|
||
|
||
/* The next operand should be wrapped in parentheses rather than separated
|
||
from this one by a comma. This is used for various instructions, like
|
||
the load and store instructions, which want their operands to look like
|
||
"displacement(reg)" */
|
||
#define TIC80_OPERAND_PARENS (02)
|
||
|
||
/* This operand is a bit number and may use symbolic names such as "eq.b",
|
||
"or.f", etc. */
|
||
#define TIC80_OPERAND_BITNUM (04)
|
||
|
||
/* This operand names a register. The disassembler uses this to print
|
||
register names with a leading 'r'. */
|
||
#define TIC80_OPERAND_GPR (010)
|
||
|
||
/* This operand names a floating point accumulator register. The disassembler
|
||
prints these with a leading 'a'. */
|
||
#define TIC80_OPERAND_FPA (020)
|
||
|
||
/* This operand is a relative branch displacement. The disassembler
|
||
prints these symbolically if possible. */
|
||
#define TIC80_OPERAND_RELATIVE (040)
|
||
|
||
/* This flag is a hint to the disassembler for using hex as the prefered
|
||
printing format, even for small positive or negative immediate values.
|
||
Normally values in the range -999 to 999 are printed as signed decimal
|
||
values and other values are printed in hex. */
|
||
#define TIC80_OPERAND_BITFIELD (0100)
|
||
|
||
/* This operand is a condition code, which may be given symbolically as
|
||
"eq0.b", "ne0.w", etc. */
|
||
#define TIC80_OPERAND_CC (0200)
|
||
|
||
/* This operand is a control register number, or may also be given
|
||
symbolically as "EIP", "EPC", etc. */
|
||
#define TIC80_OPERAND_CR (0400)
|
||
|
||
/* This operand may have a ":m" modifier specified by bit 17 in a short
|
||
immediate form instruction. */
|
||
#define TIC80_OPERAND_M_SI (01000)
|
||
|
||
/* This operand may have a ":m" modifier specified by bit 15 in a long
|
||
immediate or register form instruction. */
|
||
#define TIC80_OPERAND_M_LI (02000)
|
||
|
||
/* Values which go in the struct tic80_opcode format field to distinguish
|
||
between various types of instructions with the same mnemonic. FIXME: Not
|
||
currently used? */
|
||
|
||
#define FMT_UNUSED 0 /* Unused */
|
||
#define FMT_SI 1 /* Short immediate format */
|
||
#define FMT_LI 2 /* Long immediate format */
|
||
#define FMT_REG 3 /* Register format */
|
||
|
||
#endif /* TIC80_H */
|